If you have the experience then 30W is acceptable, but for beginners that (paired with some cheap iron) often brings an uphill battle.As has been said, no it isn't for general small electronics 25 - 30 watt is ideal
Especially if the temperature is set at some fixed point (usually somewhere above 400C). The stable, adjustable temperature almost as important I think as the available power. Beginners are easier to catch up to task if they can get a bit higher temperature than the necessary - but still without oxidizing the solder in moments.
Your Weller won't work any more seriously than 20W average.I don't think so.